共查询到19条相似文献，搜索用时 359 毫秒
1.
2.
研究了群论中逆同态（逆同构）的一些基本性质,得到了群论中同态（同构）和逆同态（逆同构）的相互关系,并用逆同态（逆同构）的方法证明了群论中的同态基本定理和群的同构定理. 相似文献
3.
研究了群论中逆同态(逆同构)的一些基本性质,得到了群论中同态(同构)和逆同态(逆同构)的相互关系,并用逆同态(逆同构)的方法证明了群论中的同态基本定理和群的同构定理. 相似文献
4.
设G,H是有限生成Abe群,G到H的群同态的集合为Hom(G,H)。文章主要研究G,H之间的群同态,给出了G到H的群同态的集合Hom(G,H)的一个完全的刻画。 相似文献
5.
本文主要探讨了一些常见的,简单的群之间的同态问题,给出了计算它们之间群同态的一般步骤,并选择了有代表性的例子来阐述如何计算它们之间群同态. 相似文献
6.
7.
8.
子群、不变子群是一类重要的子群,它在群的理论中起着重要的作用.本论文以子群、不变子群和商群为基本语言,以群同态映射为纽带总结了群同态理论. 相似文献
9.
关于交换群的充分条件 总被引：1，自引：0，他引：1
张继荣 《咸阳师范学院学报》2002,17(6):13-14
利用指数及群同态的性质给出交换群的几个充分条件。证明了若G的指数为n ,则G为交换群当且仅当n=2；若ψ（x)=x^n为群G上单同态映射，则当n=3,2,-1时或φ（x)=x^n-1，是G上单射或满映射时G为交换群。 相似文献
10.
11.
12.
13.
成矿流体类型及研究方法综述 总被引：3，自引：0，他引：3
按照成矿流体来源和性质将其分为与基性、超基性岩浆有关的流体，与酸性岩浆有关的热液流体，与海相喷流-沉积有关的热液流体，与沉积盆地演化有关的盆地流体，与区域变质作用有关的变质流体和有机成矿流体等六种类型。并介绍成矿流体的热力学条件研究、成分研究、成矿流体的同位素示踪和同位素年代学研究的内容和常用方法。 相似文献
14.
混合岩化作用和混合岩成因模式研究 总被引：1，自引：0，他引：1
具备油气水组合的圈闭构造，在地下深处能形成重熔岩浆，富含气体的岩浆能导致圈闭隐爆而上侵入，研究认为，混合岩化作用及混合岩就是在这种圈闭隐爆过程中产生形成的。 相似文献
15.
Alison Kelly Juliet Alexander Umar Azam Carol Bretherton Gillian Burgess Alice Dorney 《British Journal of Sociology of Education》1982,3(3):281-295
Parents of 116 first‐year pupils at an urban comprehensive school were studied by questionnaire and interview. They were asked about their educational and occupational aspirations for their children, their views on sexual equality and their children's out‐of‐school activities. Educational aspirations were found to be high, with little differentiation between the sexes. Parents were enthusiastic about their daughters studying physical science and neutral about craft subjects. Occupational aspirations were also high and although they tended to be sex‐stereotyped, parents were found to be generally supportive of non‐traditional choices. Class differences were few. Most parents were in favour of working mothers, equal pay and men helping with housework. However these egalitarian attitudes coexisted with more traditional assumptions about male breadwinners and a woman's main responsibility being to her children. Parents’ own domestic labour and that which they required of their children was strongly sex‐stereotyped. The messages which children receive about gender from their homes are contradictory, but not as uniformly traditional as many teachers assume. 相似文献
16.
Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China 总被引：2，自引：0，他引：2
DING Wei-wei DAI Jin-xing CHU Feng-you HAN Xi-qiu 《浙江大学学报(A卷英文版)》2007,8(7):1011-1020
We studied the geochemical characteristics of the fluid inclusions in the Ordovician carbonates and the Oligocene Shahejie Formation sandstones from 15 wells in the Gangxi Fault Belt, Huanghua Depression. The fluid inclusions are all sec- ondary with gas/liquid ratio of 5%~10%. Base on Raman they are mainly composed of H2O, CO2 and CH4. The homogenization temperatures, combined with burial and geothermal history of the host rock, indicate that the fluid flows in the Shahejie Formation and the Ordovician carbonates were trapped in Neocene. Using a VG5400 mass spectrometer, the helium isotopic compositions were analyzed. Interpretation of results suggested a significant amount of mantle-derived helium mainly accumulating in the intersections of the NWW trending Xuzhuangzi and NE trending Gangxi faults. The maturity of hydrocarbon decreases from the intersection to the outside pointing out that the fluid related to the NWW trending Xuzhuangzi and NE trending Gangxi faults. These factors implied the fluid inclusions have a close relationship to the local tectonic setting. Gangxi Fault Belt experienced intensive Neo-tectonic activities in Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its tec- tonic status of extensional stress field. Mantle uplift caused the movement of magma that carried mantle-derived gases and deep heat flows, the deep-rooted tension faults provided the passages for the gases and heat flows to shallow crust levels. 相似文献
17.
云南个旧锡铜多金属矿集区为中国最重要的锡、铜多金属矿集区之一,经过同位素统计分析得出:硫的来源以生物地层沉积硫和海水硫酸盐为主,并可能混入了岩浆硫源;铅的来源复杂,并含有过量的放射性成因铅,明显有上地幔物质参与,且经过了均匀混合,组成稳定;碳来源由海相碳酸盐衍生而来,并主要与碳酸盐溶解作用有关,且可能有部分直接来源于深源碳;氧来源于浅部地壳经部分熔融形成. 相似文献
18.
LI Zi-long CHEN Han-lin YANG Shu-feng TAINOSHO Yoshiaki SHIRAISHI Kazuyuki OWADA Masaaki 《浙江大学学报(A卷英文版)》2007,8(7):1004-1010
Fluids (fluorine, chlorine, and OH) in accessory minerals (apatite, titanite and allanite) of Pan-African granitoids(Group-Ⅰ granitoids, Group-Ⅱ granitoids and Mefjell Plutonic Complex) from the Sor Rondane Mountains, East Antarctica were precisely measured by an electronic microprobe analyzer in this study. Apatites in the granites have commonly high fluorine contents. However, fluorine contents from the Group-Ⅰ, Group-Ⅱ granitoids and Mefjell Plutonic Complex (MPC) are of important variation, which F contents (3.21～7.20 wt%) in apatite from the Group-Ⅱ granitoids are much higher than those from the Group-Ⅰ granitoids (1.22～3.60 wt%) and the MPC (3.21～4.11 wt%). Titanite in the MPC has a low fluorine content (0.23～0.50 wt%), being less than those in the Group-Ⅰ granitoids (2.28 wt%) and Group-Ⅱ granitoids (1.85～2.78 wt%). Fluorine in allanite in the Group-Ⅱ granitoids seems to have much lower contents than those from the Group-Ⅰ granitoids and the MPC. Higher fluorine contents in the titanite from the Group-Ⅱ granitoids may be mainly controlled by late-magmatic fluid-rock interaction processes associated with melt, but may not be indicative of original magma contents based on its petrographic feature. Due to very lower chlorine contents from all of accessory minerals, the authors suggest that titanite and apatite with higher fluorine contents in the Group-Ⅱ granitoids have much lower H2O (OH) contents compared with those in the Group-Ⅰ granitoids according to the partition among (F, Cl, OH).Fluorine contents in whole-rock samples show a variation from the higher in the Group-Ⅰ granitoids to the lower in the Group-Ⅱ granitoids and the MPC, which are consistent with the changes of those from the biotite and hornblende as well as fluorite occurred in the Group-Ⅰ granitoids reported previously. Based on the above study of fluorine in accessory minerals and combined with the previous fluorine contents from biotites and hornblendes, the authors suggest that apatites and titanites with higher F contents in the Group-Ⅱ granitoids and the MPC may not be an indicator of higher fluorine contents in whole-rock, which reflect fluorine contents in magma sources and/or late-thermal activity. Higher fluorine contents in apatite, titanite and allanite may be an additional evidence of A-type affinity. 相似文献
19.
Susana Garcia-Barros Cristina Martínez-Losada María Garrido 《International Journal of Science Education》2013,35(15):2095-2122
The object of this paper is to learn what little children know about the inside of their bodies before they have studied these particular aspects at school. The data for our project were collected by means of drawings made by 342 Spanish children aged four to seven. They were required to depict where the food, drink, and air which enter their bodies go. In addition to this, we intend to study how the ideas of children evolve during three consecutive years. For this purpose, a group of 32 subjects was monitored. Our findings show that the children recognise specific organs in their own bodies which they associate with the intake of food and air. Furthermore, they usually extrapolate those organs to other animals they are familiar with. Their ideas about the digestive system are more adequate than the ones about the respiratory system, though their ideas improve as they become older, above all those concerning the digestive system. Taking these findings as a basis, this paper suggests some points to be taken into consideration for teaching purposes. 相似文献